Air Gate Seal Assembly for Leak-Tight ECS Airflow Switching
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Solution Overview
Problem
Current environmental control systems in aircraft lack an efficient mechanism to coordinate airflow between compressors, leading to inefficiencies and potential leakage in air flow management.
Innovation Solution
An isolation valve with a housing, air gate, seal, and retainer mechanism that allows selective blocking of airflow to specific outlets, utilizing a seal that conforms to the internal surface for sealing pressure, and an actuator for precise control, is introduced to manage airflow effectively between air cycle machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a valve mechanism is added to coordinate airflow to compressors, then airflow management efficiency is improved, but device complexity increases
Solution Approach 1:
The air gate is divided into multiple independent sealing segments, each capable of blocking a specific outlet. This segmentation allows the valve to control airflow to multiple compressors independently while using a single actuator, improving airflow management efficiency without proportionally increasing complexity.
Solution Approach 2:
The air gate serves multiple functions: it acts as both a flow control element and a sealing element, and can position itself in multiple states (blocking first outlet, blocking second outlet, or blocking both). This multi-functionality reduces the need for separate components, improving efficiency while managing complexity.
2Reliability
If a seal mechanism is added to prevent leakage, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The seal is designed to be self-retaining through its interaction with the seal groove geometry. The seal groove features an inbound portion and an outbound portion that create a self-locking effect, allowing the seal to maintain its position and sealing function without requiring additional active retention mechanisms, thus improving reliability while minimizing added complexity.
3Reliability
If the seal is designed to conform to the housing internal surface, then sealing effectiveness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The seal is designed with compliance characteristics that allow it to adapt its shape to the housing internal surface through deformation under operating conditions. This parameter change (from rigid to compliant geometry) enables effective sealing without requiring extremely tight manufacturing tolerances on either the seal or housing, thus improving sealing effectiveness while reducing manufacturing precision requirements.
Data Source
AI summary
An isolation valve comprising: a housing having an internal surface within the housing, the internal surface having a first outlet and second outlet; an air gate having an outward face opposite the internal surface, the air gate located within the housing and configured to move to at least one of a first position blocking flow to the first outlet, a neutral position blocking flow to neither the first outlet nor second outlet, and a second position blocking flow to the second outlet; a seal groove located on the outward face of the air gate; a seal located within seal groove, the seal configured to form a sealed connection with the internal surface around at least one of the first outlet when in the first position and the second outlet when in the second position; and a retainer configured to secure the seal within the seal groove using a fastening mechanism.